Merge pull request #2056 from govuk-forms/dependabot/npm_and_yarn/postcss-8.5.12

Bump postcss from 8.5.9 to 8.5.12

Author: stephencdaly

package-lock.json

@@ -24,7 +24,7 @@
     "autoprefixer": "^10.5.0",
     "esbuild": "0.28.0",
     "jsdom": "^29.0.2",
-    "postcss": "^8.5.9",
+    "postcss": "^8.5.12",
     "sass": "^1.99.0",
     "snazzy": "^9.0.0",
     "standard": "^17.1.2",